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Main Mineralization Mechanism of Magmatic Sulphide Deposits in China
Author(s) -
Zhongli Tang
Publication year - 1997
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1997.tb00345.x
Subject(s) - liquation , geology , geochemistry , magma , magma chamber , mineralization (soil science) , lava , petrology , volcano , cracking , chemistry , soil science , soil water
Before intruding, primary magmas have undergone liquation and partial crystallization at depth; as a result the magmas are partitioned into barren magma, ore–bearing magma, ore–rich magma and ore magma, which then ascend and are injected into the present locations once or multiple times, thus forming ore deposits. The above–mentioned mineralizing process is known as deep–seated magmatic liquation–injection mineralization. The volume of the barren magma is generally much larger than those of the ore—bearing magma, ore—rich magma and ore magma. In the ascending process, most of the barren magma intrudes into different locations or outpours onto the ground surface, forming intrusions or lava flows. The rest barren magma, ore–bearing magma, ore–rich magma and ore magma may either multiple times inject into the same space in which rocks and ores are formed or separately inject into different spaces in which rocks and ores are formed. The intrusions containing such deep–seated magmatic liquation–injection deposits have a much smaller volume, greater ore potential and higher ore grade than that of in–situ magmatic liquation deposits. Consequently this mineralizing process results in the formation of large deposits in small intrusions.